package Person;
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManager {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> array = new ArrayList<Student>();
        while (true) {
            System.out.println("------欢迎来到学生管理系统------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看所有学生");
            System.out.println("5 退出");
            System.out.println("请输入你的选择： ");
            String line = sc.nextLine();
            switch (line) {
                case "1":
                    addStudent(array);// ("添加学生");

                    break;
                case "2":
                    deleteStudent(array);  // ("删除学生");

                    break;
                case "3":
                    updateStudent(array);//("修改学生");

                    break;
                case "4":
                    findAllStudent(array);//("查看所有学生");

                    break;
                case "5":
                    System.out.println("谢谢使用=-=");
                    System.exit(0);//退出
            }

        }
    }
    public static void addStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        String sid;
        while(true){
        System.out.println("请输入学生学号： ");
         sid = sc.nextLine();
        boolean flag=isUsed(array,sid);
        if(flag){
            System.out.println("此学号已经被使用，请重新输入： ");
        }else{
            break;
        }
        }
        System.out.println("请输入学生姓名： ");
        String name  =sc.nextLine();
        System.out.println("请输入学生年龄： ");
        String age = sc.nextLine();
        System.out.println("请输入学生居住地： ");
        String address = sc.nextLine();
        Student s = new Student();
        s.setAddress(address);
        s.setAge(age);
        s.setName(name);
        s.setSid(sid);
        array.add(s);
        System.out.println("添加学生成功----====----");
    }
    public static boolean isUsed(ArrayList<Student> array,String sid){
        Scanner sc = new Scanner(System.in);
        boolean flag = false;
        for(int i=0;i<array.size();i++){
            Student s= array.get(i);
            if(s.getSid().equals(sid)){
                flag=true;
                break;
            }
        }
        return flag;
    }
    public static void findAllStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        if(array.size()==0){
            System.out.println("无信息，请添加信息后在查找： ");
return;
        }else{
            System.out.println("学号\t\t姓名\t年龄\t居住地");
            for(int i=0;i<array.size();i++){
                Student s= array.get(i);
                System.out.println(s.getSid()+"\t"+s.getName()+"\t"+s.getAge()+"\t"+s.getAddress());
            }
        }
    }
    public static void deleteStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
    System.out.println("请输入需要删除的学生学号： ");
    String sid = sc.nextLine();
    int index=-1;
    for(int i=0;i<array.size();i++){
        Student s = array.get(i);
        if(s.getSid().equals(sid)){
            index = i;
            break;
        }
    }
    if(index==-1){
        System.out.println("无此学号的信息，请重新输入");
    }else{
        array.remove(index);
        System.out.println("删除成功--==--");
    }
}
public static void updateStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
    System.out.println("请输入需要修改的学生学号： ");
    String sid = sc.nextLine();
    int index=-1;
    for(int i=0;i<array.size();i++){
        Student student = array.get(i);
        if(student.getSid().equals(sid)){
            index = i;
            break;
        }
    }
    if(index == -1){
        System.out.println("学号信息不正确，请重新输入");
    }else{
        System.out.println("请输入学生新姓名：");
        String name = sc.nextLine();
        System.out.println("请输入学生新年龄： ");
        String age = sc.nextLine();
        System.out.println("请输入学生新居住地： ");
        String address = sc.nextLine();
        Student c=  new Student();
        c.setSid(sid);
        c.setAge(age);
        c.setName(name);
        c.setAddress(address);
        array.set(index,c);
        System.out.println("修改成功！----");
    }

}

}